Applet can't load when using Mozilla Firefox and IE Tab

Question

I have a page that includes an applet
I must include page within the IE Tab rules for auto procces because of design aspects
When the page loads, Firefox tells: load: class XXXXX not found
This very same page does not fail to load applet if not included in IE Tab Rules
I tried the latest versions of Firefox (3.0beta) and IE Tab(1.5)
It appears to be a Mozilla Firefox problem
But, any way, any idea?

Answer 1

I just discover Mozilla Firefox does not work with deprecated Applet tags.
I must use Object tags.
Since Netscape and Safari does not acept properly Object tags, i decide to use a javascript to switch between both methods.
Here a sample:
<%
CARPETA = Request.Form("UltimoArchivoCarpeta")
ArchivoProcesar = Request.Form("UltimoArchivoArchivo")
ArchivoProcesar = CARPETA & ArchivoProcesar
ArchivoProcesar = replace(ArchivoProcesar,"\","\\")
URLACTUAL = Request.ServerVariables("SERVER_NAME")
URLACTUAL = "http://" & URLACTUAL
%>
<script language="javascript">
var _app = navigator.appName;
if (_app == 'Microsoft Internet Explorer') {
document.write('<OBJECT ',
'classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"',<!-- Java Plugin any version -->
' width="0" height="0">',
'<PARAM name="code" value="JUploadApplet.class">',
'<PARAM name="archive" value="<%=URLACTUAL%>/java/ddsApplets.jar">',
'<PARAM name="file" value="<%=ArchivoProcesar%>">',
'<PARAM name="urlUpload" value="<%=URLACTUAL%>/VENTAS_UPLOAD/ConfirmarUploadPedidos.asp">',
'<PARAM name="urlRedir" value="<%=URLACTUAL%>/VENTAS_UPLOAD/MostrarPreviewArchivo.asp">',
'<PARAM name="urlFault" value="<%=URLACTUAL%>/SimpleError.asp">',
'</OBJECT>');
else { <!-- No es IE Explorer ni Firefox con IE Tab -->
document.write( '<APPLET code="JUploadApplet.class"',
'archive="<%=URLACTUAL%>/java/ddsApplets.jar"',
' width="0" height="0">',
'<PARAM name="file" value="<%=ArchivoProcesar%>">',
'<PARAM name="urlUpload" value="<%=URLACTUAL%>/VENTAS_UPLOAD/ConfirmarUploadPedidos.asp">',
'<PARAM name="urlRedir" value="<%=URLACTUAL%>/VENTAS_UPLOAD/MostrarPreviewArchivo.asp">',
'<PARAM name="urlFault" value="<%=URLACTUAL%>/SimpleError.asp">',
'</APPLET>');